WM8944BECSSLASHR datasheet(40/165 Pages) CIRRUS

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WM8944B

Rev 4.3

The DRC parameters are listed in Table 16.

REF

PARAMETER

DESCRIPTION

DRC_KNEE_IP

Input level at Knee1 (dB)

DRC_KNEE_OP

Output level at Knee1 (dB)

DRC_HI_COMP

Compression ratio above Knee1

DRC_LO_COMP

Compression ratio below Knee1

DRC_KNEE2_IP

Input level at Knee2 (dB)

DRC_NG_EXP

Expansion ratio below Knee2

DRC_KNEE2_OP

Output level at Knee2 (dB)

Table 16 DRC Response Parameters

The noise gate is enabled when the DRC_NG_ENA register is set. When the noise gate is not

enabled, parameters 5, 6, 7 above are ignored, and the DRC_LO_COMP slope applies to all input

signal levels below Knee1.

The DRC_KNEE2_OP knee is enabled when the DRC_KNEE2_OP_ENA register is set. When this bit

is not set, then parameter 7 above is ignored, and the Knee2 position always coincides with the low

end of the DRC_LO_COMP region.

The “Knee1” point in Figure 16 is determined by register fields DRC_KNEE_IP and DRC_KNEE_OP.

Parameter Y0, the output level for a 0dB input, is not specified directly, but can be calculated from the

other parameters, using the equation:

Y0 = DRC_KNEE_OP

– (DRC_KNEE_IP * DRC_HI_COMP)

The DRC Compression / Expansion / Limiting parameters are defined in Table 17.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R29 (1Dh)

DRC Control 1

DRC_NG_ENA

DRC Noise Gate Enable

0 = Disabled

1 = Enabled

R32 (20h)

DRC Control 4

12:8

DRC_KNEE2_IP

000000

Input signal level at the Noise Gate

threshold ‘Knee2’.

00000 = -36dB

00001 = -37.5dB

00010 = -39dB

… (-1.5dB steps)

11110 = -81dB

11111 = -82.5dB

See Table 18 for details

Only applicable when

DRC_NG_ENA = 1.

7:2

DRC_KNEE_IP

000000

Input signal level at the Compressor

‘Knee’.

000000 = 0dB

000001 = -0.75dB

000010 = -1.5dB

… (-0.75dB steps)

111100 = -45dB

111101 = Reserved

11111X = Reserved

See Table 18 for details

WM8944BECS/R 数据表(PDF) 40 Page - Cirrus Logic

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